#keyboard {
    background-image: url(../images/keyboard_1920.jpg);
    height: 876px;
}

@media screen and (max-width: 1366px) {
    #keyboard {
        background-image: url(../images/keyboard_1366.jpg);
        height: 700px;
    }
}

@media screen and (max-width: 960px) {
    #keyboard {
        background-image: url(../images/keyboard_960.jpg);
        height: 590px;
    }
}

@media screen and (max-width: 640px) {
    #keyboard {
        background-image: url(../images/keyboard_640.jpg);
        height: 493px;
        background-position: center 18px;
    }
}